Two Genevieves

Prospect, Inactive

Commodities and mineralogy

Main commodities Hg
Ore minerals cinnabar
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale D-4
Latitude 61.81615
Longitude -157.31822
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Two Genevieves prospect is on an east-facing bluff overlooking Cribby Creek, about 2.5 miles north of the Kuskokwim River. The prospect is at an elevation of about 730 feet, about 0.6 mile south-southeast of the center of section 18, T. 20 N., R. 44 W., of the Seward Meridian. The location is accurate within about 0.3 mile.

Geologic setting

Geologic description

At the Two Genevieves prospect, an altered mafic sill largely composed of silica, mariposite, and carbonate minerals intrudes sandstone and shale of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955). Cinnabar and fragments of graphite occur in vugs and in a breccia zone in the upper part of the altered sill. According to Cady and others (1955), the Two Genevieves prospect is one of the few occurrences of graphite associated with cinnabar known in the Aniak district.
Geologic map unit (-157.320600158886, 61.8154608243529)
Mineral deposit model Silica-carbonate mercury (Cox and Singer, 1986; model 27c).
Mineral deposit model number 27c
Alteration of deposit Mafic sill altered to secondary silica, mariposite, and carbonate.

Production and reserves

Workings or exploration Only surface sampling and evaluation has taken place, mostly prior to 1952 (Cady and others, 1955; Cobb, 1976 [OFR 76-605]).
Indication of production None

References

MRDS Number A013435

References

Gray, J.E., Gent, C.A., Snee, L.W., and Wilson, F.H., 1997, Epithermal mercury-antimony and gold-bearing vein lodes of southwest Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 287-305
Wells, J.T., and Ghiorso, M.S., 1988, Rock alteration, mercury transport, and metal deposition at Sulphur Bank, California: Economic Geology, vol. 83, p. 606-618.
White, D. E., and Robinson, C. E., 1962, Sulphur Bank, California, a major hot spring quicksilver deposit, in Engel, A.E.J., James, H.L., and Leonard, B.F., eds., Petrologic studies: A volume in honor of A.F. Buddington: Boulder, Colorado, Geological Society of America p. 397-428.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)
Last report date 4/30/2003